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Light-reflecting sheet and shaped article thereof

a technology of light-reflecting sheets and shaped articles, which is applied in the direction of instruments, synthetic resin layered products, transportation and packaging, etc., can solve the problems of high cost of process such as bending or other, and insufficient study on thermoformable sheets, etc., to achieve excellent light-reflecting properties and high light-protection. the effect of high light-reflectan

Inactive Publication Date: 2007-09-20
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021] It is an object of the present invention to provide a thin, light-reflecting sheet and a shaped article with flame retardancy and excellent light reflecting properties of high light reflectance and high light shielding using a polycarbonate resin composition which solves the problems of the aforementioned conventional technology.

Problems solved by technology

A conventional light-reflecting sheet used includes a metal plate, a metal foil laminated plastic sheet, a metal deposited plastic sheet, a foamed stretched PET film and the like, but has such problems as little freedom in selecting a shape in molding and higher cost in process such as bending or others
However, such light-reflecting materials using these polycarbonate resin have been mainly studied in the field of injection-molded articles, while study has been insufficient on a thermoformable sheet, which requires thin wall, weight reduction and area expansion in using for a backlight reflection plate of liquid crystal displays or other.
However, titanium oxide admixed in high concentration causes degradation of the polycarbonate resin matrix, thereby causing a problem of lowering light reflectance in shaped articles of the resin.
When a large volume of titanium oxide is combined, severer reduction in the molecular weight of polycarbonate is caused, thereby inevitably lowering mechanical strength.
Furthermore, the polycarbonate resin admixed with a large amount of titanium oxide has the problem of easily having such failures as draw resonance, surface roughening and sticking to rolls in sheet extrusion and foaming and uneven thickness in thermoforming during the production of sheet and article, and the necessity of establishing a method to improve the above problem has been more and more increased toward thin wall, weight reduction and area expansion in a light-reflecting sheet and board of liquid crystal displays.
In addition, it is generally considered to be difficult to satisfy both flame retardancy and high light reflection in a thin wall shaped article 0.6 mm thick or less, which is required in backlight reflecting panels of liquid crystal displays and others.

Method used

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  • Light-reflecting sheet and shaped article thereof
  • Light-reflecting sheet and shaped article thereof
  • Light-reflecting sheet and shaped article thereof

Examples

Experimental program
Comparison scheme
Effect test

production example 1

[Production of PC Oligomer]

[0127] In 400 L of a 5% by mass sodium hydroxide aqueous solution was dissolved 60 kg of bisphenol A to prepare a sodium hydroxide aqueous solution of bisphenol A.

[0128] Next, the sodium hydroxide aqueous solution of bisphenol A kept at room temperature and methylene chloride were introduced at a flow rate of 1.38 L / hr and 69 L / hr, respectively through an orifice plate into a tube reactor with an inner diameter of 10 nm and a length of 10 m, into which phosgene was concurrently injected at a flow rate of 10.7 kg / hr to continuously react for 3 hrs.

[0129] The tube reactor used herein was double-tube, of which a jacket section was flown with cooling water to keep the temperature of the discharged reaction solution at 25° C. pH of the effluent was adjusted to 10 to 11.

[0130] The reaction solution thus obtained was left to stand to separate and discard the water phase and collect the methylene chloride phase (220 L), yielding a PC oligomer (concentration, 3...

production example 2

[Production of Reactive PDMS]

[0131] 1,483 g of octamethylcyclotetrasiloxane, 96 g of 1,1,3,3-tetramethyldisiloxane, and 35 g of 86% by mass of sulfuric acid were mixed and stirred at room temperature for 17 hrs. The oil phase was then separated, to which 25 g of sodium hydrogen carbonate was added to stir for 1 hr. After filtration, the reaction mixture was vacuum-distilled at 150° C. under 3 Torr (4×102 Pa) to remove low-boiling products to yield an oil.

[0132] 294 g of the oil obtained above was added to a mixture of 60 g of 2-allylphenol and platinum chloride-alcoholate complex in an amount of 0.0014 g in terms of platinum at 90° C. The mixture was stirred for 3 Ms while keeping the temperature at 90 to 115° C.

[0133] The product was extracted with methylene chloride, washed with 80% by mass aqueous methanol three times to remove excess 2-allylphenol. The product was dried with anhydrous sodium sulfate and the solvent was distilled off to a temperature of 115° C. under a reduced...

production example 3

[Production of PC-PDMS Copolymer]

[0135] In 2 L of methylene chloride were dissolved 138 g of the reactive PDMS obtained in Production Example 2, with which 10 L of the PC oligomer obtained in Production Example 1 was further admixed. To this were added a solution dissolving 26 g of sodium hydroxide in 1 L of water and 5.7 cm3 of triethylamine, which was stirred at 500 rpm and reacted at room temperature for 1 hr.

[0136] After completing the reaction, a solution prepared by dissolving 600 g of bisphenol A in 5 L of a 5.2% by mass sodium hydroxide aqueous solution 8 L of methylene chloride, and 96 g of p-ert-butylphenol were added to the above reaction mixture which was stirred at 500 rpm and reacted at room temperature for 2 hrs.

[0137] After the reaction, 5 L of methylene chloride was added to the reaction mixture, which was then water-washed with 5 L of water, alkaline-washed with 5 L of a 0.03 mol / L sodium hydroxide aqueous solution, acid-washed with 5 L of a 0.2 mol / L hydrochlor...

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Abstract

The present invention provides a thin light-reflecting sheet with excellent light property of flame retardancy, a high light-reflectance and a high light-shielding ability, which is formed from a polycarbonate resin composition containing a combination of 70% to 30% by mass of a polycarbonate-based polymer (A) and 30% to 70% by mass of titanium oxide (B) having a difference of moisture concentration at 100° C. with that at 300° C. of 2700 ppm by mass or less. The invention also provides a shaped article thereof.

Description

TECHNICAL FIELD [0001] The present invention relates to a light-reflecting sheet and a shaped article thereof. More specifically, the present invention relates to a thin sheet and a shaped article having excellent flame retardancy and light-reflecting property obtained from a polycarbonate resin composition. BACKGROUND ART [0002] Generally, applications of a light-reflecting material include, sign boards, displays, liquid display backlight systems and the like. A conventional light-reflecting sheet used includes a metal plate, a metal foil laminated plastic sheet, a metal deposited plastic sheet, a foamed stretched PET film and the like, but has such problems as little freedom in selecting a shape in molding and higher cost in process such as bending or others [0003] In recent years many technologies have also been proposed for light reflecting materials. Such technologies include blending with particularly surface-treated titanium oxide (for example, refer to Patent Documents 1 to ...

Claims

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Application Information

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IPC IPC(8): B32B27/00
CPCC08J5/18C08J2369/00C08K3/22C08K9/02C08K9/06C08K9/08G02B5/0808C08L27/18C08L69/00C08L83/04C08L2666/02Y10T428/31507C08K3/24C08L33/00C08L33/12
Inventor KAWATO, HIROSHIKOGURE, MASAMI
Owner IDEMITSU KOSAN CO LTD
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